Matter in Our Surrounding Test

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Matter in Our Surrounding Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

Evaporation that occurs directly from the solid phase below the melting point is called as:

A
Sublimation

B
condensation

C
distillation

D
None of above

Solution

Evaporation occurs directly from the solid phase below the melting point, as commonly observed with the Sublimation of ammonium chloride.
Question 2
1 / -0

Conversion of a liquid into vapour form at any temperature below its boiling point is called as ______________.

A
solidification

B
gasification

C
evaporation

D
liquifaction

Solution

In the case of liquids, a small fraction of particles at the surface, having higher kinetic energy, can break away from the forces of attraction of other particles and gets converted into vapour. The conversion of a liquid into vapours at any temperature below its boiling point is called evaporation.
Question 3
1 / -0

Evaporation of water will be faster:

A
near the sea

B
far away from the sea

C
both at equal rates

D
None of the above

Solution

An increase in humidity reduces the rate of evaporation. Area near the sea will be more humid as compared to the area far away from the sea. Hence, evaporation will be faster away from the sea.
Question 4
1 / -0

While putting clothes for drying up, why do we spread them out?

A
Surface area is directly proportional to rate of evaporation.

B
Increase in surface area decreases rate of evaporation.

C
Increase in surface area increases rate of evaporation.

D
Both A and C.

Solution

Evaporation is a surface phenomenon. If the surface area is increased, the rate of evaporation increases. While putting clothes for drying up, we spread them out, because, more area is exposed to sun and wind which speeds up the rate of evaporation.
Question 5
1 / -0

Why does applying spirit give us a cool sensation?

A
Spirit condenses quickly.

B
Spirit evaporates at a slower rate.

C
Spirit evaporates quickly.

D
None of above

Solution

Spirits are very volatile liquids, which means they evaporate very quickly. When we apply spirit on our body, its particles gain energy from the surface and evaporate, thus, giving our body a cool sensation.
Question 6
1 / -0

When liquid takes up heat from the surrounding, the surrounding ____________.

A
cools down

B
heats up

C
remains unchanges

D
None of above

Solution

Liquid requires latent heat of vaporization. So, when the liquid takes up the heat from the surrounding to vaporize, the temperature of surrounding reduces, and it cools down due to loss of heat.
Question 7
1 / -0

Why do clothes dry faster on a windy day?

A
Evaporation increases with increase in wind speed.

B
Evaporation increases with increase in humidity.

C
Evaporation decreases with increase in wind speed.

D
None of these

Solution

Evaporation increases with increase in wind speed. With the increase in wind speed, the particles of water vapour move away with the wind, decreasing the amount of water vapour in the surrounding. Hence, clothes dry faster on a windy day.
Question 8
1 / -0

A volatile liquid _____________.

A
vaporizes quickly at room temperature

B
solidifies quickly at room temperature

C
liquifies quickly at room temperature

D
does not vaporize quickly

Solution

A volatile liquid is one that evaporates or vaporizes quickly at room temperature. Volatile liquids have low boiling point. As a result, they evaporate very easily at room temperature.
Question 9
1 / -0

Why do we wear cotton clothes in summer?

A
Cotton absorbs water

B
It leads to sweating

C
Both a and b.

D
None of above

Solution

Cotton absorbs water, and thus, causes sweating. Sweat comes out the clothing and in contact with the atmosphere. It evaporates taking up the heat from the surrounding and thus, gives a cooling effect.
Question 10
1 / -0

Spacing between particles of gas can be decreased. Hence, __________.

A
they have no compressibility

B
they are rigid

C
they have compressibility

D
None of above

Solution

Spacing between particles of gas can be can be decreased by increasing pressure. Hence, gases have high compressibility. Solids and liquids are not compressible as the spacing between their particles cannot be decreased.

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Re-Attempt Weekly Quiz Competition

Matter in Our Surrounding Test - 27

Result

Matter in Our Surrounding Test - 27

Score

-

Rank

-

SHARING IS CARING

Question 1

Sublimation

condensation

distillation

None of above

Solution

Question 2

solidification

gasification

evaporation

liquifaction

Solution

Question 3

near the sea

far away from the sea

both at equal rates

None of the above

Solution

Question 4

Surface area is directly proportional to rate of evaporation.

Increase in surface area decreases rate of evaporation.

Increase in surface area increases rate of evaporation.

Both A and C.

Solution

Question 5

Spirit condenses quickly.

Spirit evaporates at a slower rate.

Spirit evaporates quickly.

None of above

Solution

Question 6

cools down

heats up

remains unchanges

None of above

Solution

Question 7

Evaporation increases with increase in wind speed.

Evaporation increases with increase in humidity.

Evaporation decreases with increase in wind speed.

None of these

Solution

Question 8

vaporizes quickly at room temperature

solidifies quickly at room temperature

liquifies quickly at room temperature

does not vaporize quickly

Solution

Question 9

Cotton absorbs water

It leads to sweating

Both a and b.

None of above

Solution

Question 10

they have no compressibility

they are rigid

they have compressibility

None of above

Solution

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